Fire-alarm.



No. 880,521 PATENTED MAR. 3, 1908.

' W. GLENGK.

FIRE ALARM.

APPLIOATION FILED JUNE 14.1907.

nuenfoz W; Lu eases WILLIAM GLENGK, OF NEWARK, NEW JERSEY.

IIIREPALABM.

Specification of Letters Patent.

Patented March 3, 1908.

. Application filed 1m 14.1907 Serial No. 378.990.

To all whom it may concern:

Be .it known that I, WILLIAM GLENoK, a citizen of the United States, residing at Newark, in the county of Essex and State of 'New Jersey, have invented a new and useful Improvement in a Fire-Alarm, of which the following is a specification.

This invent1on is a device for giving an audible signal at any desired point in case of fire either at or some distance from the place where the signal is sounded.

The invention consists in the novel features of construction hereinafter fully described, pointedout in the claims and shown in the accom anying drawing.

in t 10 drawing vA represents a suitable casing which can be located at the point to be protected andwhichcarries a binding post A, from which extends downwardly a rod A provided with a cap A at its lower end, the

rod bein r of a conducting material. A semispherica celluloid cap is carried by the under slde of the casing A and incloses the lower projectingportion of the rod A Arranged within the cap B, is a conducting plate G into which is threaded a screw C, which passes throu h the cap B. The s ring 0 encircles the l ower end of the rod A ut does not come into contact with the rod. This spring is secured at its upper end to the bottom of the casing A' and at its'lower end to the contact s ring is to 11ft the plate G into contact with tile cap A of the rod A but is normally held out of engagement with the lower end of the plate C. The tendency of this 7 rod as the head of the screw 0 does not permit its passage through the celluloid ca B.

My invention also includes a bell D, a battery Da switch D?, and an electrical circuit which includes these elements and which also include the binding post A, and the contact plate C. The circuit is always broken as ong as the contact plate C is separated from the lower end of the rod A But in case of fire the celluloid cap B will be quickly destroyedand the spring C will at once draw up the contact plate 0, and the circuit will be completed and the alarm bell'will ring until the circuithas been broken at the switch D or some other point.

It'will be obvious that the casing A may be represented by a simple shelf, platform or other support for the binding post A and other attached parts.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

A fire alarm device comprising a rod of conducting material, a celluloid cap inclosing an end portion of said rod, a contact plate secured -to the celluloid-cap, a spring encircling said rod and secured at one end to the said contact plate to draw same into engagement with the rod, and an electrical circuit including said rod and said contact plate as and for the purpose set forth.

. WILLIAM GLENCK.

Witnesses:

Enw. O. CLARK HENRY ALBERT. 

